[ladelfa]

Some years ago I got an Enviracaire EWM-220, which looks to be discontinued now. This is a warm-steam one that also has a UV bulb in it to (presumably) sanitize the water. Twin tanks where one gets used up before the other one starts to drain, so you can refill them one at a time.

Didn't see this mentioned in another comment, but when it's time to de-calcify the boiling chamber (very easy to access on this model) I squirt a little Lysol toilet boil cleaner in there and let it foam and sizzle on the scale buildup for about ten minutes, then wash it away.

Anecdotally, I saw this model in a couple different violin shops around the time I got it. Typically in one of these places there will be showrooms where you can try out bows and instruments, and they usually have about a hundred violins/violas/cellos hanging up in there.

Humidity control is extremely important for fine string instrument storage, so I figured if this is the model a shop has settled upon to protect $100-200K of their merchandise, it's probably a good choice.